php – 无法在5.4上安装Laravel / Passport

我跟着docs,所以我跑了.

composer require laravel/passport

但这就是我得到的……

Using version ^6.0 for laravel/passport
./composer.json has been updated

Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements Could not be resolved to an installable set of packages.

  Problem 1
    - laravel/passport v6.0.7 requires illuminate/database ~5.6 -> satisfiable by illuminate/database[5.6.x-dev, 5.7.x-dev, 5.8.x-dev, v5.6.0, v5.6.1, v5.6.10, v5.6.11, v5.6.12, v5.6.13, v5.6.14, v5.6.15, v5.6.16, v5.6.17, v5.6.19, v5.6.2, v5.6.20, v5.6.21, v5.6.22, v5.6.23, v5.6.24, v5.6.25, v5.6.26, v5.6.27, v5.6.28, v5.6.29, v5.6.3, v5.6.30, v5.6.31, v5.6.32, v5.6.33, v5.6.34, v5.6.35, v5.6.36, v5.6.37, v5.6.38, v5.6.39, v5.6.4, v5.6.5, v5.6.6, v5.6.7, v5.6.8, v5.6.9, v5.7.0, v5.7.1, v5.7.10, v5.7.11, v5.7.2, v5.7.3, v5.7.4, v5.7.5, v5.7.6, v5.7.7, v5.7.8, v5.7.9] but these conflict with your requirements or minimum-stability.

看看composer.json文件看起来我正在使用5.4版本

“照亮/数据库”：“5.4.*”,

这是有道理的,因为我正在使用该版本的框架.我该怎么办？更新风险很大吧？
更重要的是为什么它没有开箱即用？

解决方法:

对于laravel 5.4,您应该使用：

composer require laravel/passport=~4.0

如果你没有指定版本,它将安装最新版本,实际是laravel 5.6